Radio frequency identification transponder
First Claim
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1. A radio-frequency identification (“
- RFID”
) transponder for use in an RFID system, the RFID transponder comprising;
a volatile memory array for storing data;
a first power supply for powering circuitry associated with the RFID transponder, the circuitry comprising the volatile memory array;
wherein when power ceases to be provided to the volatile memory array by the first power supply, the data in the volatile memory array is validly maintained therein for a predetermined time period; and
wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array.
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Abstract
A radio frequency identification transponder includes a power supply and a dynamic memory array that stores data. When power from the power supply ceases, the data in the dynamic memory array is validly maintained for a predetermined period of time. The dynamic memory array is responsive to an interrogating signal for selectively updating the data. A radio frequency identification transponder includes a signal processor that extracts an identifier from the interrogation signal and is responsive to the identifier and the stored data to determine whether some or all of the identifier is stored in the dynamic memory array.
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Citations
24 Claims
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1. A radio-frequency identification (“
- RFID”
) transponder for use in an RFID system, the RFID transponder comprising;a volatile memory array for storing data; a first power supply for powering circuitry associated with the RFID transponder, the circuitry comprising the volatile memory array; wherein when power ceases to be provided to the volatile memory array by the first power supply, the data in the volatile memory array is validly maintained therein for a predetermined time period; and wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- RFID”
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17. An RFID system comprising:
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an RFID transponder comprising; a volatile memory array for storing data; a first power supply for powering circuitry associated with the RFID transponder, the circuitry comprising the dynamic memory array; wherein when power ceases to be provided to the volatile memory array by the first power supply, the data in the dynamic memory array is validly maintained therein for a predetermined time period; wherein the predetermined time period is determined by discharging of the dynamic memory array through stray leakage paths within the dynamic memory array; and a transponder interrogator for providing an interrogation field and reading data from the RFID transponder. - View Dependent Claims (18)
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19. A method of storing data in a radio-frequency identification (“
- RFID”
) transponder adapted for use in an RFID system, the method including the steps of;storing data in a volatile memory array of the RFID transponder; providing a first power supply associated with the volatile memory array; validly maintaining the data in the volatile memory array for a predetermined time period after power ceases to be provided to the volatile memory array by the first power supply; and wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array. - View Dependent Claims (20, 21, 22, 23, 24)
- RFID”
Specification